Evaluation of outcome and safety profile in high-dose BEAM and Benda-EAM chemotherapy with subsequent autologous stem cell transplantation in lymphoma patients.

Introduction: Autologous hematopoietic stem cell transplantation (auto- HSCT) preceded by high-dose chemotherapy is a mainstay in relapsed/refractory lymphoma. The study aimed to compare the efficacy and adverse event profile between BEAM and Benda-EAM (BeEAM) regimens and to evaluate prognostic factors for survival in lymphoma patients undergoing auto-HSCT.

Material and methods: We present a single-center retrospective analysis of 82 lymphoma patients (median age 52; IQR 38.2-62.2) who received BEAM (47.6%) or BeEAM (52.4%) followed by auto-HSCT between January 2015 and December 2021.

Results: During the post-HSCT period 58% of patients experienced febrile neutropenia (51.3% vs. 64.3% in BEAM and BeEAM, respectively; p = 0.27), 80.5% mucositis (69.2% vs. 90.7%; p = 0.02), 42.5% bacteremia (50% vs. 35.7%; p = 0.26), and 18.8% pneumonia (31.6% vs. 7.1%; p = 0.01). Patients who received bendamustine required more platelet transfusions (p = 0.02). In the multivariate Cox regression model, C-reactive protein level on the first day of hospitalization (hazard ratio - HR = 1.03, 95% CI: 1.01-1.06) and days of agranulocytosis (HR = 1.15, 95% CI: 1.00-1.32) were predictors of poorer overall survival (OS), whereas hemoglobin level at the auto-HSCT was a protective factor in terms of OS (HR = 0.43, 95% CI: 0.23-0.78) and progression-free survival (PFS) (HR = 0.66, 95% CI: 0.45-0.96). The median OS since auto-HSCT was 87 months, while the median PFS was 49 months. No differences in PFS and OS between BEAM and BeEAM regimens were proven.

Conclusions: Conditioning with BEAM and BeEAM regimens is associated with comparable post-transplant outcomes. The toxicity of these regimens is comparable; however, BEAM is associated with a higher risk of pneumonia, while BeEAM is associated with a higher risk of mucositis.